Spice Girl Victoria Beckham announced her next career move on Thursday evening in a way nobody could have anticipated!The mum-of-four took to Instagram, where she shared a cheeky wet-look snapshot showing off a tanned, toned derriere clad in high-cut white shorts.MORE: Victoria Beckham confesses her favourite snack is 'boring'The designer and makeup entrepreneur added a caption which was also on the risqué side, showing off her legendary wry sense of humour.She wrote: "Can you guess what’s